gummy bark disease of sweet orange (citrus sinensis) trees has been reported from a few citrus growing regions of the world. the disease symptoms consist of mild to severe stem pitting and brown gummy flecks in the bark of sweet orange trees on sour orange ( c. aurantium) rootstock, being conspicuous several centimeter above the bud :union: on the trunk. the pits were usually impregnated with b...

Figure 1 Figure 2 Citrus fruits are traditional agricultural products in Egypt. Citrus volkameriana is the best rootstock for growing citrus in Egypt’s desert areas (newly reclaimed land). It is far superior to other rootstocks used in Egypt in its resistance to Citrus tristeza virus as well as its tolerance to drought. Constraints to fruit production are mainly related to tree decline caused b...

hop stunt viroid (hsvd) isolates have been reported as the causal agent of citrus cachexia in mazandaran province and recently shown to be associated with yellow corky vein disease of sweet orange and split bark disorder of sweet lime in the fars province, iran. in the present work isolation and partial characterization of viroids from citrus trees affected by gummy stem blight is reported from...

The Sudanese citrus industry is mainly based on oldline cultivars of grapefruit, sweet orange and willow leaf mandarin, grafted almost exclusively on sour orange. Infection with graft-transmissible agents, viroids in particular, may have deleterious effects on the productivity of these citrus species and, more importantly, limits the choice of rootstocks should sour orange be replaced by altern...

Alcoholic extracts of the rhizomes of Alpinia galanga, Andrographis paniculata, bark of Cinnamomum zeylanicum, rind of Citrus decumana, Desmodium triflorum, seeds of Hydnocarpus wightiana, rhizomes of Kaempfaria galanga, Lippia nodiflora, tender leaves of Morinda citrifolia, rhizomes of Pollia serzogonian, Tephrosia purpuria and rhizomes of Zingiber zerumbeth showed good in vitro anthelmintic a...

in this study, the possible infection of thomson navel, moro blood sweet orange, page mandarin and webber pomelo with citrus viroids was investigated. biological indexing was performed by grafting on etrog citron (c. medica) and maintained in temperature-controlled greenhouse. after inoculation, rna was extracted by sds– potassium acetate method. detection of citrus viroids was done reverse tra...